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Horizontal Pressure Gradient and Bed Shear Stress Under Double Dam-Break Driven Swash and Validation of a Reynolds-Averaged Navier-Stokes Equations Based Model.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Horizontal Pressure Gradient and Bed Shear Stress Under Double Dam-Break Driven Swash and Validation of a Reynolds-Averaged Navier-Stokes Equations Based Model./
Author:	Olney, Courtney.
Description:	1 online resource (107 pages)
Notes:	Source: Masters Abstracts International, Volume: 84-04.
Contained By:	Masters Abstracts International84-04.
Subject:	Civil engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29261900click for full text (PQDT)
ISBN:	9798351457642

Horizontal Pressure Gradient and Bed Shear Stress Under Double Dam-Break Driven Swash and Validation of a Reynolds-Averaged Navier-Stokes Equations Based Model.
Olney, Courtney.

Horizontal Pressure Gradient and Bed Shear Stress Under Double Dam-Break Driven Swash and Validation of a Reynolds-Averaged Navier-Stokes Equations Based Model. - 1 online resource (107 pages)

Source: Masters Abstracts International, Volume: 84-04.

Thesis (M.C.E.)--University of Delaware, 2022.

Includes bibliographical references

Swash zone processes drive foreshore morphodynamics through sediment transport gradients. Sediment transport rates are often estimated using bed shear stress as the main hydrodynamic driver. However, the importance of pressure gradients relative to bed shear stress in the swash zone is still poorly known. Thus, it is important to investigate the importance between pressure gradients and bed shear stress as a function of cross-shore distance, swash phase and interaction intensity.A double dam-break mechanism was used to produce near prototype swash events and allowed for analysis of swash interactions. The time offset between the bore propagation varied (0 s to 3 s) to investigate swash interactions. The impermeable immobile bed roughness was varied between a smooth bed (d50 = 0.166 cm) and rough bed (d50 = 3.05 cm) on a fixed slope to see the effect on foreshore hydrodynamics. A total of 14 different cases were analyzed with the goal of collecting 10 repetitions for each case. The laboratory experiments collected in-situ data of depth, velocity, and pressure over a swash event. The hydrodynamic data for each case were ensemble averaged and verified a numerical model solving the two-dimensional (2D) Reynolds-Averaged Navier-Stokes (RANS) equations simulating a double dam break. The model allows for visualization of the hydrodynamic data over the entire domain and is used to identify the type of swash interactions occurring for each case.Mobilization parameters such as the Mobility parameter, Shields parameter, Sleath parameter, and a combined parameter were analyzed to quantitatively describe the probability for hypothetical sediment to move based on different forcing mechanisms.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798351457642Subjects--Topical Terms:

860360
Civil engineering.
Subjects--Index Terms:

Bed shear stressIndex Terms--Genre/Form:

542853
Electronic books.

Horizontal Pressure Gradient and Bed Shear Stress Under Double Dam-Break Driven Swash and Validation of a Reynolds-Averaged Navier-Stokes Equations Based Model.
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245 1 0 $a Horizontal Pressure Gradient and Bed Shear Stress Under Double Dam-Break Driven Swash and Validation of a Reynolds-Averaged Navier-Stokes Equations Based Model.
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500 $a Source: Masters Abstracts International, Volume: 84-04.
500 $a Advisor: Puleo, Jack A.
502 $a Thesis (M.C.E.)--University of Delaware, 2022.
504 $a Includes bibliographical references
520 $a Swash zone processes drive foreshore morphodynamics through sediment transport gradients. Sediment transport rates are often estimated using bed shear stress as the main hydrodynamic driver. However, the importance of pressure gradients relative to bed shear stress in the swash zone is still poorly known. Thus, it is important to investigate the importance between pressure gradients and bed shear stress as a function of cross-shore distance, swash phase and interaction intensity.A double dam-break mechanism was used to produce near prototype swash events and allowed for analysis of swash interactions. The time offset between the bore propagation varied (0 s to 3 s) to investigate swash interactions. The impermeable immobile bed roughness was varied between a smooth bed (d50 = 0.166 cm) and rough bed (d50 = 3.05 cm) on a fixed slope to see the effect on foreshore hydrodynamics. A total of 14 different cases were analyzed with the goal of collecting 10 repetitions for each case. The laboratory experiments collected in-situ data of depth, velocity, and pressure over a swash event. The hydrodynamic data for each case were ensemble averaged and verified a numerical model solving the two-dimensional (2D) Reynolds-Averaged Navier-Stokes (RANS) equations simulating a double dam break. The model allows for visualization of the hydrodynamic data over the entire domain and is used to identify the type of swash interactions occurring for each case.Mobilization parameters such as the Mobility parameter, Shields parameter, Sleath parameter, and a combined parameter were analyzed to quantitatively describe the probability for hypothetical sediment to move based on different forcing mechanisms.
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653 $a Bed shear stress
653 $a Dam-break
653 $a Horizontal pressure gradient
653 $a Numerical model
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710 2 $a University of Delaware. $b Civil and Environmental Engineering. $3 3189857
773 0 $t Masters Abstracts International $g 84-04.
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